Vibrating compressor

ABSTRACT

A vibrating compressor having a housing with an inner tube and an outer tube formed concentrically. The inner tube is connected with the outer tube via an end plate. The end plate being disposed at one axial end of the inner tube and the outer tube to form a housing closed end and a housing open end. A permanent magnet is fitted to an inner circumferential surface of the outer tube. A driving coil is provided in a gap between the permanent magnet and the inner tube. A cylinder is fitted into an inside of the inner tube and a hollow piston equipped with a valve is inserted into the cylinder. The hollow piston is connected to the driving coil via a bobbin and is supported by support springs in such a manner as to perform reciprocating motion. A cylinder head connected to the housing forms a compression chamber at an end of the cylinder and compressed fluid is discharged from the compression chamber by the reciprocating motion of the piston. First and second cover plates are disposed at opposite ends of the housing to form a sealed container with the housing.

FIELD OF THE INVENTION

This invention relates generally to a vibrating compressor, and morespecifically to a vibrating compressor whose component members are easyto manufacture and assemble at reduced manufacturing cost, and also to avibrating compressor in which an electrical path is maintained by usingmechanical component members without using lead wires that are prone tocause electrically poor contact, breakage, etc. due to its construction.

DESCRIPTION OF THE PRIOR ART

Vibrating compressors have heretofore been widely used as compressorsfor onboard refrigerators. In this type of vibrating compressor, as willbe described with reference to a typical example shown in FIG. 5, adriving coil 116 which vibrates as driven in a magnetic field, and apiston 118 which reciprocates in accordance with the vibration of thedriving coil 116 are disposed in series in the longitudinal direction.With this arrangement, this type of vibrating compressor is generally ofa slender shape.

By improving this point, the present inventor invented a vibratingcompressor having the construction shown in FIG. 1 and filed JapanPatent Application No. 258366/1993.

In FIG. 1, a compressor proper 1 is supported resiliently via springs 3and 4 in a sealed container 2 comprising a housing 2d and a cover plate2c for closing the upper open end of the housing 2d. Numeral 31 denotesa yoke consisting of hollow cylindrical inner and outer tubes 32 and 33,both concentrically and integrally formed with an end plate 34 disposedat the upper end of the inner and outer tubes 32 and 33.

Numeral 35 denotes a permanent magnet formed into a hollow cylindricalor cross-sectionally circular arc shape and fixedly fitted to the innercircumferential surface of the outer tube 33. A cup-shaped yoke cap 36is fixedly fitted to the lower part of the outer tube 33 to close thelower open end of the yoke 31.

Numeral 37 denotes a cylinder having an integrally formed flange 38 atthe upper end thereof and engaged with the inside of the inner tube 32.In the cylinder 37 provided is a hollow cylindrical piston 15 having anintake valve 14 at the upper end thereof in such a manner as toreciprocate in the axial direction of the cylinder 37.

At the lower end of the piston 15 fixedly fitted is a supporting member16 to which a hollow cylindrical driving coil 17 disposed between theinner tube and the permanent magnet 35 is fixedly fitted. Supportsprings 18 and 19 are provided above and below the supporting member 16.Numeral 39 and 40 are insulating rings interposed between the supportspring 18 and the inner tube 32, and between the support spring 18 andthe supporting member 16, respectively.

Next, numeral 41 denotes a cylinder head fixedly fitted to the flange 38at the upper end of the cylinder 37 via a ring-shaped gasket 42 to forma compression chamber 43. The compression chamber 43 is connected to adischarge tube 26 in such a manner that compressed fluid can flow.Numeral 44 denotes an outer electrode provided on the sealed container 2for supporting a power-feeding electrode 45 in an insulated and airtightmanner. The electrode 45 on the outer electrode 44 and the driving coil17 are electrically connected to each other via a lead wire 46, thesupport spring 18, a lead wire 47, the driving coil 17, the supportingmember 16, the support spring 19, the yoke cap 36, the support springs 4and 3, and the housing 2d.

With the above construction, as alternating current is fed to thedriving coil 17, the piston 15 performs pumping action, causingcompressed fluid to discharge from the discharge tube 26.

Numeral 29 denotes a discharge valve, 22 a spring, 23 an air intake andoil feeding tube, 24 a riser part, 25 an oil feeding part, 26 adischarge tube, 27 an intake tube, and 28 lubricating oil, respectively.

In the construction shown in FIG. 1 where the piston 15 is disposed inan inside space formed by the driving coil 17, as described above, thevibrating compressor can be formed into a low profile. In theconstruction shown in FIG. 1 where the compressor proper 1 isresiliently supported in the sealed container 2 via the springs 3 and 4,however, the sealed container 2 has to be provided separately, leadingto increased cost. In addition, there are some other problems to beimproved.

SUMMARY OF THE INVENTION

It is an object of this invention to omit the sealed container 2 shownin FIG. 1 by forming a sealed container with the outer tube and coverplate of the compressor proper.

It is another object of this invention to provide a vibrating compressorwhose component members are easy to manufacture and assemble at reducedmanufacturing cost.

It is still another object of this invention to provide a vibratingcompressor in which a supporting member 16 is fixedly fitted to thelower end of a piston 15, and an electrical path is maintained via thesupporting member 16 using mechanical component members without usinglead wires.

It is a further object of this invention to provide a vibratingcompressor in which a drive coil can be wound easily.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a prior-art vibrating compressor.

FIG. 2 shows a vibrating compressor embodying this invention.

FIG. 3 is a front view of the washer terminal shown in FIG. 2.

FIG. 4 is a cross-sectional view of the washer terminal shown in FIG. 2.

FIG. 5 shows a prior-art construction illustrating the relationshipbetween a driving coil and a piston.

FIG. 6 shows a construction of an embodiment of this invention in whichthe construction shown in FIG. 5 has been improved.

FIG. 7 is a perspective view of a bobbin used in FIG. 6.

FIG. 8 shows an embodiment of this invention illustrating the manner inwhich a bobbin and a piston are connected to each other in theconstruction shown in FIG. 6.

FIG. 9 is a longitudinal sectional view illustrating an embodiment ofthis invention supporting a permanent magnet.

FIG. 10 is an enlarged perspective view of part A in FIG. 9.

FIG. 11 is an enlarged longitudinal sectional view illustrating themanner in which a cylinder head is fixedly fitted to a cylinder in theprior art shown in FIG. 1.

FIG. 12 is an enlarged cross-sectional view of a gasket embodying thisinvention.

FIG. 13 is an enlarged longitudinal sectional view illustrating acylinder supporting construction embodying this invention.

DETAILED DESCRIPTION OF THE EMBODIMENT

The construction shown in FIG. 1 that was previously proposed by thepresent inventor has an advantage that the vibrating compressor can beformed into a low profile. In completing a commercially marketablevibrating compressor, however, there is much room for improvement interms of construction and manufacturing cost.

FIG. 2 shows a vibrating compressor embodying this invention. FIG. 2also discloses that an electrical path is maintained in the internalconstruction without using lead wires.

Unlike the prior-art double sealed construction shown in FIG. 1, thevibrating compressor 101 according to this invention shown in FIG. 2 hasa construction dispensing with the sealed container 2 shown in FIG. 1.In the vibrating compressor shown in FIG. 2, a sealed container 102 isconstructed of a double cylinder-shaped housing 140 having an open endat one end and a bottomed end at the other, and cap-shaped cover plates141 and 142 fitted to both ends of the housing 140 to maintainairtightness. The housing 140 comprises integrally formed outer andinner cylinders or tubes 140a and 140b. The outer and inner cylinders ortubes are joined by an end plate. The outer and inner cylinders or tubes140a and 140b may not necessarily be integrally formed. They may befabricated separately and joined together by an appropriate joiningmeans which functions as an endplate.

The outer cylinder or tube 140a of the housing 140 serves as a yoke anda casing. On the inner circumferential surface of the outer cylinder140a fixedly fitted is a circular arc-shaped permanent magnet 111. Atthe central part of the inner cylinder or tube 140b provided in theaxial direction is a cylinder 143 which is fixedly fitted to the innercylinder 140b with a plurality of screws 144.

Inside the cylinder 143 engaged is a cylindrical piston 145, an end ofwhich is fixed to the cylindrical portion 146c of a bobbin 146 accordingto this invention, which will be described later. A driving coil 116 iswound on the bobbin 146 and disposed in a space between the permanentmagnet 111 and the inner circumferential surface of the inner cylinder140b so that the driving coil 116 is allowed to reciprocate verticallyin accordance with the reciprocating motion of the piston 145.

The bobbin 146 is made of an electrically conductive material andcomprises four coil yoke pieces 146b, a flange portion 146a formedintegrally with the coil yoke pieces 146b, and a cylindrical portion146c connected to the flange portion 146a and fixedly fitted to an endof the piston 145, as shown in FIGS. 7 and 8. The driving coil 116 iswound on the bobbin 146 while being supported by the four coil yokepieces 146b. The number of coil yoke pieces 146b is not limited to four,and may of course be any plural number.

Each of the coil yoke pieces 146b has bent portions 146d at the upperand lower parts thereof for retaining the coil ends of the driving coil116 to prevent the wound driving coil 116 from loosening. In FIG. 7, thebent portion 146d provided at the lower part of the driving coil 116 isnot disposed immediately beneath the bent portion 146d at the upperpart, but the arrangement of the bent portions 146d may not be limitedto that shown in the figure. The bent portion 146d at the lower part ofthe coil yoke piece 146b may be provided immediately beneath the bentportion 146d at the upper part of the coil yoke piece 146d by lancingand raising.

At least one of the bent portions 146d at the upper part has a slitgroove 146e for holding a leading end of the driving coil 116 fed by anautomatic coil winding machine.

Although there may be various methods of winding a driving coil 116 onthe bobbin 146 having such a construction, one method is such that aninsulating member 147 is provided on the flange portion 146a of thebobbin 146 and an electrically conductive terminal 148 is mounted on theinsulating member 147, as shown in FIG. 2, before the driving coil 116is wound on the bobbin 146, for example.

FIG. 5 shows a prior-art construction illustrating the relationshipbetween the driving coil and the piston. Although FIG. 5 shows a typehaving a construction where a piston 118 is disposed beneath the drivingcoil 116, unlike the construction shown in FIG. 1, the figure is notintended to illustrate the relative positions of the driving coil andthe piston, but is intended to illustrate the construction of thedriving coil 116 shown in FIG. 5.

The driving coil 116 as shown in FIG. 5 has heretofore been wound in thefollowing manner: First, part of the driving coil 116 is wound as aninner part on a winding jig having a predetermined diameter, and windingoperation is suspended upon completion of the winding of the inner partof the driving coil 116. Four reinforcing coil yoke pieces 138-1 and twoterminal pieces 138-2 are manually positioned, and then the remainder ofthe driving coil 116 is wound as an outer part on the inner part. Thus,predetermined turns of the driving coil 116 are wound with the fourreinforcing coil yoke pieces 138-1 and the two terminal pieces 138-2interposed between the inner and outer parts. Leading and trailing endsof the driving coil 116 are wound and electrically connected to the twoterminal pieces 138-2.

After that, a flange portion 138-3 is spot-welded to the ends of thecoil yoke pieces 138-1 and the terminal pieces 138-2, and varnish isapplied to the coil surface for solidification after the winding jig hasbeen removed to prevent the driving coil 116 from loosening. An end ofthe piston 118 is welded to the flange portion 138-3 to substantiallyintegrate the piston 118 and the driving coil 116 into one unit.

In the prior-art method of manufacturing the driving coil 116 byinterposing coil yoke pieces 138-1 and terminal pieces between the innerand outer parts of the driving coil 116 to maintain the strength of thedriving coil 116, winding operation has had to be suspended to interposethe coil yoke pieces 138-1 and the terminal pieces 138-2. In addition,manual positioning of the coil yoke pieces 138-1 and the terminal pieces138-2 has prevented the automatic winding of the driving coil 116.Furthermore, connecting the flange portion 138-3 to the coil yoke pieces138-1 and the terminal pieces 138-2 by spot welding, for example, hasimpaired work efficiency.

The construction of the bobbin described with reference to FIGS. 7 and 8is intended to overcome the shortcomings of the prior-art constructionshown in FIG. 5.

After the completion of the preparation described in reference to FIGS.7 and 8, a winding jig having an outside diameter corresponding to theinside diameter of the coil yoke piece 146b is inserted into the bobbin146, and a leading end of the driving coil is caused to engage with theslit groove 146e of the bobbin 146 by the automatic coil windingmachine. Predetermined turns of the driving coil 116 are wound on thebobbin 146. The trailing end of the driving coil 116 is electricallyconnected to the terminal piece 148a of a terminal 148. The bobbin 146is removed from the winding jig, varnish is applied to the surface ofthe driving coil 116 for insulation and solidification, and then thepiston 145 is inserted into the cylindrical portion 146c and fixedlyfitted by welding.

Although the piston 145 is welded to the bobbin 146 after the drivingcoil 116 has been wound on the bobbin 146 in the above description, thepiston 145 may be welded in advance to the bobbin 146 before the drivingcoil 116 is wound on the bobbin 146. There may be other various methodsof winding the driving coil 116 on the bobbin 146.

FIG. 6 shows the construction of an embodiment of this invention using abobbin of the construction described in reference to FIGS. 7 and 8. Thedriving coil 116 is wound on the bobbin 146 shown in FIG. 7. In theconstruction shown in FIG. 6, the shortcoming described in reference toFIG. 5, that is, the troublesome manual positioning of the coil yokepieces 138-1 and the terminal pieces 138-2 during the winding of thedriving coil 116 has been solved.

An insulating member 147 is provided on the flange portion 146a of thebobbin 146, and an electrically conductive terminal 148 is provided onthe surface of the insulating member 147. A leading end of the drivingcoil 116 wound on the coil yoke piece 146b is connected to any one ofthe coil yoke piece 146b, and the trailing end thereof is connected tothe terminal piece 148a of the terminal 148.

As shown in FIG. 2, a support spring 120 is provided between the flangeportion of the bobbin 146 and the inner cylinder 140b of the housing140, and a support spring 121 is provided between the terminal 148provided on the flange portion 146a of the bobbin 146 via the insulatingmember 147, and a washer terminal 151 provided on a cap-shaped coverplate 142 via an insulation base 150; both ends of the support spring121 being electrically connected by surface contact to the terminal 148and the washer terminal 151. In this way, the piston 145 is supported bya pair of upper and lower support springs 120 and 121.

The washer terminal 151 is an electrically conductive disc-shaped memberat the central part of which a plurality of (three, for example) lancedand raised pawls 152 are formed, as shown in FIGS. 3 and 4, front andcross-sectional views of the washer terminal shown in FIG. 3. Arod-shaped electrically conductive member, when inserted into the lancedand raised pieces 152, is mechanically secured in position andelectrically connected to the lanced and raised pawls 152 in a so-calledpush-nut manner. The flat bottom part of the disc-shaped washer terminal151 comes in surface contact with an end of the support spring 121. Thepawls of the disc-shaped washer terminal 151 may be of various shapes,including flat- and cylindrical shapes. Methods of fixedly fitting anelectrically conductive rod-like member to the washer terminal 151 mayinclude welding, soldering and other means.

The cap-shaped cover plate 142 for closing an open end of the housing140 has at the central part thereof a protrusion 142a having ahermetically sealed terminal 153. An outer terminal 156 is electricallyconnected to the cover plate 142, and the outer terminal 156 and acenter terminal 154 are insulated by an insulating member 155 made of aglass material. Both ends of the center terminal 154 protrude from thecover plate 142, and the electrically conductive washer terminal 151 isdisposed in a circular recess 142b formed by the protrusion 142a at thecentral part of the cover plate 142 via the aforementioned insulationbase 150. Both the washer terminal 151 and the center terminal 154 areelectrically and mechanically connected and secured in position in thepush-nut manner. An intake tube 130 is installed on the cover plate 142.

The bottomed end of the housing 140 is covered by a cap-shaped coverplate 141 that forms a space 157 and has a discharge tube 129 and aprojection at the central part thereof. The projection at the centralpart of the cover plate 141 forms a discharge valve chamber 158, inwhich a spring 159 that is preloaded in the direction to push adischarge valve 132 disposed at an end of a cylinder head forming thecylinder chamber 160. The cylinder-side construction of the piston 145is such that a piston head 161 is press-fitted to the piston 145, and anintake valve 122 is disposed between the piston head 161 and the piston145.

With this construction, when an alternating voltage is applied acrossthe center terminal 154 and the outer terminal 156 of the hermeticallysealed terminal 153, an alternating current flows in an electrical pathcomprising the center terminal 154, the washer terminal 151, the supportspring 121, the terminal 148, the driving coil 116, the bobbin 146, thesupport spring 120, the inner cylinder 140b, the outer cylinder 140a andthe outer terminal 156.

Thus, the driving coil 116 disposed in the magnetic field of thepermanent magnet 111 vibrates vertically in accordance with the polarityof the alternating current. The piston 145 that is substantiallyintegrated with the driving coil 116 also reciprocates verticallytogether with the driving coil 116. The vertical reciprocating motion ofthe piston 116 is amplified by pairs of upper and lower support springs120 and 121. The intake and discharge valves 122 and 132 performspumping action in accordance with the amplified vertical reciprocatingmotion of the piston 116, causing a gas, such as a refrigerantintroduced in the sealed container 102 via the intake tube 130, to flowinto the discharge valve chamber via the piston 145, the intake valve122, the cylinder chamber 160 and the discharge valve 132. Then, thecompressed gas, such as a refrigerant, is discharged into a refrigeratorcondenser via the space 157 and the discharge tube 129.

In FIG. 2, the sealed container 102 is sealed in the following manner.That is, the circumferential joint parts of the housing 140 and thecover plate 141 are welded together along the circumference thereof, asnumerals 162-1 and 162-2 indicate weldments. The circumferential jointparts of the housing 140 and the cover plate 142 are also weldedtogether along the circumference thereof, as numerals 163 and 164indicate weldments.

As described above, this invention has such a construction that theouter wall of the vibrating compressor proper is constructed of theouter cylinder 140a and the cover plates 141 and 142 by omitting thesealed container 2 shown in FIG. 1. In the following, some additionalimprovements as to the supporting arrangements for the permanent magnetand the cylinder will be described, referring to FIG. 1.

The permanent magnet 35 is normally fixedly fitted to the innercircumferential surface of the outer tube 33 with adhesive.

In refrigerant compressors for onboard refrigerators where resistance tochlorofluorocarbon, oil and heat is required, adhesive of specialspecifications has to be used. In practice, such adhesive, after appliedto the boundary surfaces between the outer tube 33 and the permanentmagnet 35, has to be placed in a 150° C. oven for more than 5 hours, forexample, for curing. Furthermore, after the compressor proper isextracted from the oven, the time to cool the compressor proper isrequired. This makes it inevitable to adopt the batch production system,rather than the assembly line system, resulting in frequent interruptionof manufacturing processes and increased in-process products. Since theadhesive used tends to overflow from the boundary surface, it may benecessary to wipe off the excess adhesive, requiring additionalprocesses and increased manufacturing cost. The method of bonding thepermanent magnet to the outer tube with adhesive can of course be usedin conjunction with other appropriate means as necessary.

The method of fixedly fitting the cylinder head 41 to the cylinder 37 toform a compression chamber 43 is also a troublesome operation. FIG. 11is an enlarged longitudinal sectional view illustrating the state wherethe cylinder head 41 is fitted to the cylinder 37 in FIG. 1. In FIG. 11,the cylinder 37 is first inserted end positioned in the inner tube 32,and then fastened to the inner tube 32 using three mounting screws 51,for example. After that, a gasket 42 formed into a ring shape is placedon the flange 38, and the cylinder head 41 equipped with the dischargevalve 20 and the spring 22 is placed on the flange 38, positioned andfastened to the flange 38 with three mounting screws 52, for example.

This means that the fastening operation in the prior art has required atotal of six mounting screws 51 and 52, and six corresponding femalethreads to be provided on the yoke 31 and the flange 38. Moreover, theprior art has used a distortion-free gasket called a joint seal for highpressure use, made of fibers, such as asbestos fibers, bonded by arubber-based material to maintain airtightness in the compressionchamber 43. This has required high-strength screws with a tensilestrength of 120 kg/cm² as the mounting screws 52. The need for thislarge fastening power has made mounting operation extremely troublesome.

In the vibrating compressor shown in FIG. 1, power is fed to the drivingcoil 17 via an electrical path comprising the power-feeding electrode45, the lead wire 46, the support spring 18, the lead wire 47, thedriving coil 17, the supporting member 16, the support spring 19, theyoke cap 36, the support springs 4 and 3, the housing 2d and the outerterminal 44. In this arrangement, there is a fear of breakage of thelead wires 46 and 47.

In the following, arrangements according to this invention that cansolve the aforementioned problems will be described.

FIG. 9 is a longitudinal sectional view of an embodiment of thisinvention for supporting a permanent magnet, and FIG. 10 is an enlargedperspective view of part A in FIG. 9. Like parts are indicated by likenumerals used in FIG. 2. In FIGS. 9 and 10, numeral 164 denotes ashouldered part provided on the side of the end plate 140c of the outercylinder 140a, against which the upper end face of the permanent magnet111 is butted. Numeral 165 denotes a lanced and raised piece provided onthe side of the open end of the outer cylinder for making contact withthe lower end faceof the permanent magnet 111 to hold the permanentmagnet 111 in position.

When the permanent magnet 111 is formed into a cross-sectional circulararc shape with a central angle of less than 120°, for example, about twolanced and raised piece 165 are provided for one permanent magnet 111.These lanced and raised pieces 165 can be easily formed by lancing andraising part of the outer cylinder 140a using a tool having achisel-like cutting edge, for example.

With the aforementioned construction, the permanent magnet 111 can befixedly fitted to the inner circumferential surface of the outercylinder 140a without using adhesive of special specifications as hasbeen required in the prior art, and the need for wiping off excessadhesive after fastening can be eliminated. Needless to say, thisfastening method can be used in conjunction with the fastening methodusing adhesive. Since the permanent magnet 111 formed in across-sectional circular arc or ring shape is magnetized in the radialdirection, producing magnetic attraction with the outer cylinder 140amade of a magnetic material, such as steel, the permanent magnet 111 canbe positioned and secured in place reliably only with an axial pushingforce against the shouldered portion 164 exerted by the aforementionedlanced and raised pieces 165.

FIG. 11 is an enlarged longitudinal sectional view illustrating thestate where the cylinder head and cylinder shown in FIG. 1 showing theprior art are joined together. Like parts are indicated by like numeralsused in FIG. 1. Numerals 51 and 52 denotes screws, respectively.

In the prior-art construction shown in FIG. 11, a hole for receiving theflange 38 of the cylinder 37 is provided on the upper part of the yoke31. The flange 38 is inserted into the hole and fixedly fitted to theyoke 31 using a plurality of (or three, for example) screws 51.Furthermore, the gasket 42 is disposed on the upper surface of theflange 38 of the cylinder 37, and then the cylinder head 41 is placed onthe gasket 42 and fixedly fitted to the flange 38 with the screws 52.

Thus, the prior-art construction shown in FIG. 11 has required a totalof six screws.

FIG. 12 is an enlarged cross-sectional view of a gasket 166 according tothis invention. In FIG. 12, numeral 166a denotes a sheet material, suchas steel, or SPCC, for example, or aluminum, or aluminum alloy, formedinto a disc shape. Numeral 166b denotes a seal layer made of a flexibleelastic material such as foamed rubber, deposited on both surfaces ofthe sheet material 166a.

The gasket 166 having the aforementioned construction is interposedbetween the cylinder flange 143a and the end plate 140c of the outercylinder 140a to fixedly fit the cylinder 143 to the housing 140.

FIG. 13 is an enlarged longitudinal sectional view of an embodiment ofthis invention illustrating a construction for supporting the cylinder.In FIG. 13, at least part of the flange 143a of the cylinder 143 isprovided in such a manner as to be embedded in the end plate of thehousing 140, preferably with the upper end face of the flange 143asubstantially flush with the upper end face of the housing 140. Numeral169 denotes a recess, a plurality of which are provided on the uppersurface of the circumferential edge of the flange 143a.

After the cylinder 143 having the aforementioned construction isinserted into the inner cylinder 140b of the housing 140, lanced andraised portions 168 are formed by a tool 167 having a chisel-like edgeat locations corresponding to the recesses 169. The cylinder 143 isfixedly fitted to the inner cylinder 140b by engaging the lanced andraised portions 168 with the recesses 169. With this arrangement, theneed for mounting screws for fixedly fitting the cylinder 143 to thehousing 140 as have been used in the prior-art construction can beeliminated, leading to reduced manufacturing cost.

As described above, this invention can accomplish cost reductions byimproving various parts of a prior-art vibrating compressor as describedin reference to FIG. 1, and by using the compressor proper also as thesealed container. Furthermore, unwanted breakage of electrical circuitscan be reduced by accomplishing electrical connections within thecompressor without using lead wires.

What is claimed is:
 1. A vibrating compressor comprising:a housinghaving an inner tube and an outer tube formed concentrically, said innertube being connected with said outer tube via an end plate, said endplate being disposed at one axial end of said inner tube and said outertube to form a housing closed end and a housing open end; a permanentmagnet fixedly fitted to an inner circumferential surface of said outertube; a driving coil provided in a gap between said permanent magnet andsaid inner tube; a cylinder fitted to an inside of said inner tube; ahollow piston equipped with a valve and inserted into said cylinder; abobbin with support springs, said hollow piston being connected to saiddriving coil via said bobbin and supported by said support springs insuch a manner as to perform reciprocating motion; a cylinder headconnected to said housing to form a compression chamber at an end ofsaid cylinder on a side into which said hollow piston is not inserted,whereby compressed fluid is discharged from said compression chamber bythe reciprocating motion of said piston; a first cover plate disposed onsaid housing open end of said outer tube for closing said open end; asecond cover plate disposed on said housing closed end, whereby a sealedcontainer is formed by said outer tube, said first cover plate and saidsecond cover plate to serve as an outer wall of the vibratingcompressor; weld connection means for fixedly fitting said first coverplate and said second cover plate to said outer tube in an airtightstate.
 2. A vibrating compressor as set forth in claim 1, furthercomprising: an intake tube for introducing refrigerant fluid into saidsealed container is fixedly fitted to one of said first cover plate andsaid second cover plate.
 3. A vibrating compressor as set forth in claim1, further comprising: said driving coil being wound on said bobbin,said bobbin having a flange and including a plurality of coil yokepieces made of an electrically conductive material for supporting saiddriving coil; and a cylindrical portion at which an end of said pistonis fixedly fitted to said flange.
 4. A vibrating compressor as set forthin claim 3, wherein said coil yoke pieces have bent portions forretaining a coil end of said driving coil at the upper and lower endsthereof.
 5. A vibrating compressor as set forth in claim 4, wherein aslit groove for holding an end of said driving coil is provided on atleast one of said bent portions provided on the upper end said coil yokepieces.
 6. A vibrating compressor as set forth in claim 1, wherein anelectrical path is formed without using lead wires by providing anelectrically conductive washer terminal for making surface contact withan end of said support spring, a hermetically sealed terminal isprovided on one of said first and second cover plates of said vibratingcompressor, an insulation base provided between said washer terminal andsaid cover plate, and a connecting mechanism for connecting a centerterminal of said hermetically sealed terminal to said washer terminal.7. A vibrating compressor as set forth in claim 6, wherein saidconnecting mechanism for connecting said center terminal of saidhermetically sealed terminal to said washer terminal is a push-nut typeconnecting mechanism with which said center terminal is electrically andmechanically connected, and said center terminal is held in positionwith said washer terminal by said push-nut type connecting mechanism. 8.A vibrating compressor as set forth in claim 1, wherein a flange isformed on an end of said cylinder on a side of said cylinder head; aring-shaped gasket is interposed between said flange and said housingend plate; said gasket formed by depositing a sealing layer made of aflexible elastic material on both sides of a sheet material made of ametallic material.
 9. A vibrating compressor as set forth in claim 1,wherein said permanent magnet is fixedly fitted to said outer tube byproviding a shoulder part on said inner circumferential surface of saidouter tube, said shoulder being positioned abutting an end plate side ofsaid permanent magnet; a plurality of lanced and raised pieces on theopen end side of said outer tube for engaging with another end of saidpermanent magnet.
 10. A vibrating compressor as set forth in claim 1,wherein said cylinder is fixedly fitted to said housing end plate byforming a flange on an end of said cylinder adjacent said cylinder head,said flange being embedded in said housing end plate, and a plurality oflanced and raised portions positioned on an end face of said end plateadjacent an outer circumference of said flange, said lanced and raisedportions engaging with an end face of said flange.